Bill, sorry for the inapropriate response I thought the question was w/ reguards to manual vac heads (oops). I don't think there's a huge difference between the 2, but if there is one, it's going to be that the liner model isn't protected against the abrasion that the plaster will cause to the edges of the unit, I'd just keep an eye on the surfaces of the cleaner and look for wear and try to pad/ protect the areas that seem to be degrading too quickly.
Sorry to have misunderstood the ?